Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbdbe344a65e98b…

MALICIOUS

PDF

44.4 KB Created: 2020-03-21 19:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0edc2318d11f30eadd01616faca44c5e SHA-1: 578856bccd2a011d8686dab76cbdbaff1c75afc1 SHA-256: bcbdbe344a65e98bba3396950eaa6c0eec40f0996254943e65214bf2032c6bfa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine a more specific intent beyond the link farm activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/7/130740218/130740218.html#que+tipos+de+equilibrio+quimico+hay
    • http://ncaavideogame.com/uploads/1/3/0/7/130740178/luwewedogilepu.pdf
    • http://jazznwebsitedesigns.com/uploads/1/3/0/7/130775587/1412133.pdf
    • http://monkeesconcerts.com/uploads/1/3/0/4/130477890/mobetavurarodig-baronabilitewi-xoxeruvozosoxi.pdf
    • http://www.arinatinskypsyd.com/uploads/1/3/0/2/130271002/9520410.pdf
    • http://johnshields.ca/uploads/1/3/0/7/130740489/dokemexux_pumesemo_mezugemije.pdf
    • http://exolot-riba5.site/uploads/1/3/0/4/130483551/rudipugugesarifogo.pdf
    • http://www.electro-haptics.com/uploads/1/3/0/9/130969833/vagulusijivexo_zilufovepigo_zosoduko.pdf
    • http://www.coloradodachtoberfest.com/uploads/1/3/0/6/130620606/5875571.pdf
    • http://ponte-vedralawncare.com/uploads/1/3/0/7/130739107/pulisavuzi-wufof.pdf
    • http://www.higherbleafs.com/uploads/1/3/0/8/130814784/zilejimuporoxug_vonuxoxa_tapit.pdf
    • http://www.wcquick.com/uploads/1/3/0/6/130620764/kezumazut.pdf
    • http://www.kingaroygardencentre.com/uploads/1/3/0/2/130287872/8be1094a8358.pdf
    • http://stavrias.com/uploads/1/3/0/4/130476075/bibuxokesupeto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070d0.bin
00bcd8523f413e86650caed7d22ead2500780f6a88a8b16d8c2b3ccdeffba871
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 8248 bytes
font_01_sfnt_off00008f17.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F17 16064 bytes